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My eyes weren't cooperating with the illustration from the Theory section, animated it here (author is free to use of course) - https://imgur.com/a/hVYWBB2

(note that i reverse a few frames in the loop to be less jarring visually, the current is probably not correct when the puck is moving left)

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Helpful. Another thing to notice: You don't necessarily need a pcb. For small demo purposes you could close-pack one layer of serpentine insulated wire, then a second layer of a second serpetine wire. There would be a height difference, but perhaps not more than with a two-layer pcb.

Incredibly helpful to conceptualize what is going on. Thanks!

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